3 ms·
By the way, if you or you children need a quick and easy way to practice mental calculations, find an implementation of the game http://en.wikipedia.org/wiki/De
by frouaix 14y ago
By the way, if you or you children need a quick and easy way to practice mental calculations, find an implementation of the game http://en.wikipedia.org/wiki/Des_chiffres_et_des_lettres http://en.wikipedia.org/wiki/Des_chiffres_et_des_lettres on your phone.